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受欢迎的代数 >

5x^2-2=6

解答

5 x^{2} - 2 = 6

解答

x = \frac{2 2}{5}, x = - \frac{2 2}{5}

+1

十进制

x = 1.26491 \dots, x = - 1.26491 \dots

求解步骤

5 x^{2} - 2 = 6

将

2

到右边

5 x^{2} = 8

两边除以

5

x^{2} = \frac{8}{5}

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = \frac{8}{5}, x = - \frac{8}{5}

\frac{8}{5} = \frac{2 2}{5}

- \frac{8}{5} = - \frac{2 2}{5}

x = \frac{2 2}{5}, x = - \frac{2 2}{5}

作图

流行的例子

x \cdot (x + 1) = 20

4 x^{2} = 5 (4 x - 5)

solvefor x,x^2-2xy-2y^2+3x-y-9=0

so l v e f or x, x^{2} - 2 x y - 2 y^{2} + 3 x - y - 9 = 0

solvefor x,x^2+y^2+4z^2=10

so l v e f or x, x^{2} + y^{2} + 4 z^{2} = 10

0=-16t^2+16t+370

0 = - 16 t^{2} + 16 t + 370